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Global warming potential

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Global warming potential (GWP) is a measure of how much a given mass of greenhouse gas is believed to contribute to global warming. It is a relative scale which compares the gas in question to that of the same mass of carbon dioxide whose GWP is one.

Examples:

carbon dioxide has a GWP of exactly 1 (since it is the baseline unit to which all other greenhouse gases are compared.)
methane has a GWP of 21
Nitrogen dioxide has a GWP of 310

Some HFC HydroFluon compounds have GWPs of several thousands (HFC-23 is 11,700)

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